I just now read this. I was thinking I'd be replying that the supposed rape by the knight of that shepherd's daugher may have really been something a lot more complicated, but it wasn't about music, so...
This is a thing thad doesn't have anything specifically to do with folk music. It happens everywhere, with every profession. So it happens with folk musicians.
It's not right, but to some extent, life tests people's survival skills, and it's impossible to protect people. What folks CAN do is try to warn people. Folks need to know how to recognize bad or inappropriate behavior. As Anne Lister said, it's not a matter for the law. It's a matter of teaching young people how to say "no" when someone asks for nude photos, and the fact is, you won't know when that request happens. Additionally, that young person probably wouldn't listen, anyway. To some extent, this is an opportunity for learning at the school of hard knocks. Hopefully, the person will figure it out before much, or any, damage is done.